CN114150095A - Material distribution method for stabilizing central airflow of blast furnace - Google Patents
Material distribution method for stabilizing central airflow of blast furnace Download PDFInfo
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- CN114150095A CN114150095A CN202111298989.5A CN202111298989A CN114150095A CN 114150095 A CN114150095 A CN 114150095A CN 202111298989 A CN202111298989 A CN 202111298989A CN 114150095 A CN114150095 A CN 114150095A
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- 238000009826 distribution Methods 0.000 title claims abstract description 69
- 239000000463 material Substances 0.000 title claims abstract description 37
- 238000000034 method Methods 0.000 title claims abstract description 20
- 230000000087 stabilizing effect Effects 0.000 title claims abstract description 11
- 239000000571 coke Substances 0.000 claims abstract description 100
- 239000011159 matrix material Substances 0.000 claims description 10
- 230000007547 defect Effects 0.000 abstract description 2
- 239000004744 fabric Substances 0.000 description 6
- 230000000052 comparative effect Effects 0.000 description 5
- 238000003723 Smelting Methods 0.000 description 3
- 230000007423 decrease Effects 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 239000000446 fuel Substances 0.000 description 2
- 230000009286 beneficial effect Effects 0.000 description 1
- 239000003034 coal gas Substances 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000010586 diagram Methods 0.000 description 1
- 238000004519 manufacturing process Methods 0.000 description 1
- 238000005457 optimization Methods 0.000 description 1
- 239000002245 particle Substances 0.000 description 1
- 238000013468 resource allocation Methods 0.000 description 1
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- C—CHEMISTRY; METALLURGY
- C21—METALLURGY OF IRON
- C21B—MANUFACTURE OF IRON OR STEEL
- C21B5/00—Making pig-iron in the blast furnace
- C21B5/008—Composition or distribution of the charge
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- Manufacturing & Machinery (AREA)
- Materials Engineering (AREA)
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- Organic Chemistry (AREA)
- Manufacture Of Iron (AREA)
Abstract
The invention relates to a material distribution method for stabilizing central airflow of a blast furnace, which comprises the following steps: 1) when distributing the ores, the minimum gear of the distributing chute after the ore platform is formed is directly adjusted back to the gear in the middle of the corresponding ore platform, and then the distribution is carried out on the residual ores, so that the residual ores are prevented from entering a central ore-free area; 2) when the coke is distributed, the distributing chute closes the throttle valve at the minimum gear after the coke platform is formed to stop distributing the coke, then opens the throttle valve to distribute the residual coke after the gear corresponding to the central coke is adjusted, and avoids distributing the coke on the ring belt between the secondary center and the central coke; the coke finally distributed into the furnace is divided into 2 parts of platform coke and central coke, wherein the central coke accounts for 15-20% and the platform coke accounts for 80-85%. The invention can effectively eliminate the defect of bell-less top distribution, stabilize the central air flow of the blast furnace, improve the stability of the blast furnace condition and improve the blast furnace index.
Description
Technical Field
The invention relates to the technical field of blast furnace smelting, in particular to a material distribution method for stabilizing central airflow of a blast furnace.
Background
At present, a blast furnace usually adopts a bell-less material distribution mode, multi-ring material distribution can be carried out by using bell-less material distribution, and a material distribution platform is easy to form, namely, a material distribution area consists of an annular platform and a central funnel. The size of the platform can be controlled by adjusting the amount of the coke and the ore which are loaded. If the platform is small and the funnel is large, the charge level is unstable; the platform is large and the funnel is small, so that the central gas flow is controlled. The inner diameter of a coke platform of a common large-scale blast furnace is 1.2-1.5 m, the inner diameter of an ore platform is about 1.7m, and furnace burden with large granularity is easy to roll to the center, and furnace burden with small granularity is easy to be at the edge.
The bell-less material distribution is generally provided with 8-12 rings of materials, the number of the rings is not divided equally according to the radius of a furnace throat, but the gears are integrated according to the circumferential surface, each ring corresponds to a different angular position, the material distribution is carried out from an outer ring to an inner ring step by step, the inclination angle corresponding to a material distribution chute is gradually increased from inside to outside, for example 2500m3The maximum inclination angle of a material distribution chute of the blast furnace is 50.5 ℃ and the minimum inclination angle is 16 ℃. The inclination angle difference between coke and ore is 3-5 ℃. The larger the inclination angle of the distribution chute is, the more the furnace burden is distributed on the edge. Dividing each batch into a plurality of parts according to the size of the blast furnace and the proper batch weight, wherein the distribution part of each distribution chute inclination angle is selected according to the air flow distribution condition. Generally setting 8-11 ring positions corresponding to an inclination angle, gradually increasing the inclination angle from inside to outside, and gradually inward distributing multiple rings from an outer ring; the distribution chute can rotate in a range of 360 degrees, and the inclination angle can tilt in a range of 0 to the maximum inclination angle. During material distribution, the material distribution chute tilts downwards from the standby position to a set tilt angle, then the throttle valve is opened to carry out spiral material distribution in the downward tilting process, and after the material distribution chute tilts to a minimum angle, the material distribution chute tilts upwards to return to the standby position, and the ore or coke distribution operation is completed.
When the material distribution method is adopted, the minimum inclination angle set by the material distribution of the ores is not the minimum inclination angle during the back-tipping, all the ores cannot be ensured to be scattered on the set minimum gear ring belt in the material distribution process, and about 1.5-2 t of ores can be scattered on the ring belt between the set minimum inclination angle and the minimum inclination angle during the back-tipping along with the continuous decline of the material distribution chute. Similarly, when the coke is distributed, 10% -15% of the coke can be sprinkled on an endless belt between the penultimate gear and the minimum gear in the process of distributing the coke at the penultimate gear to the minimum gear, and the sprinkling amount is not controlled. This instability is increasingly evident, especially in the case of fluctuations in the particle size of the material. The inaccuracy of the furnace burden drop point causes the poor stability of the blast furnace central airflow, and finally influences the stability of the blast furnace condition, so that the blast furnace index is poor.
Disclosure of Invention
The invention provides a material distribution method for stabilizing blast furnace central airflow, which can effectively eliminate the defect of bell-less furnace top material distribution, stabilize blast furnace central airflow, improve the stability of blast furnace conditions and improve blast furnace indexes.
In order to achieve the purpose, the invention adopts the following technical scheme:
a material distribution method for stabilizing central airflow of a blast furnace adopts a bell-less multi-ring material distribution mode; the method comprises the following steps:
1) when distributing the ores, the minimum gear of the distributing chute after the ore platform is formed is directly adjusted back to the gear in the middle of the corresponding ore platform, and then the distribution is carried out on the residual ores, so that the residual ores are prevented from entering a central ore-free area;
2) when the coke is distributed, the distributing chute closes the throttle valve at the minimum gear after the coke platform is formed to stop distributing the coke, then opens the throttle valve to distribute the residual coke after the gear corresponding to the central coke is adjusted, and avoids distributing the coke on the ring belt between the secondary center and the central coke; the coke finally distributed into the furnace is divided into 2 parts of platform coke and central coke.
The distribution matrix of the ore is
O denotes ore, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
The distribution matrix of the coke is
C denotes coke, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
The central coke content is 15-20%, and the platform coke content is 80-85%.
Compared with the prior art, the invention has the beneficial effects that:
1) when distributing the ores, the distributing chute directly tilts back to the middle gear of the corresponding ore platform from the minimum gear after the distributing of the ores on the ore platform, then the throttle valve is opened to distribute the residual ores, so that the situation that a small amount of ores enter a central ore-free area in the process that the chute continuously tilts down and the development of central airflow of a blast furnace is hindered is avoided;
2) when the coke is distributed, the distribution chute closes the throttle valve at the minimum gear after the coke distribution platform finishes distributing the coke to stop distributing the coke, and opens the throttle valve to distribute the residual coke (central coke) after the distribution chute is declined to the gear corresponding to the central coke, so as to avoid distributing the coke on an annular belt between the secondary center and the central coke gear, reduce the size of a central coke pile ring of a blast furnace charge level, improve the accuracy of the central coke quantity and further stabilize the central air flow of the blast furnace;
3) in order to ensure smooth and stable air flow of the center of the blast furnace, high-quality coke is distributed into the center (15-20 percent) and ordinary coke is distributed into the coke platform (generally 80-85 percent) according to actual coke conditions on site, so that resource allocation can be optimized, coke resources are utilized more reasonably, a better smelting effect is achieved, and the cost of iron-making coke can be reduced.
Drawings
FIG. 1 is a schematic view of the surface of the ore in comparative example 1 of the present invention.
Fig. 2 is a schematic view of the ore surface in embodiment 1 of the present invention.
FIG. 3 is a schematic representation of the coke charge level in comparative example 2 of the present invention.
FIG. 4 is a schematic view of the coke charge level in example 2 of the present invention.
FIG. 5 is a schematic diagram of the distribution of the central focal spot and the platform focal spot in example 2 of the present invention.
Detailed Description
The invention relates to a material distribution method for stabilizing central airflow of a blast furnace, wherein the blast furnace adopts a bell-less multi-ring material distribution mode; the method comprises the following steps:
1) when distributing the ores, the minimum gear of the distributing chute after the ore platform is formed is directly adjusted back to the gear in the middle of the corresponding ore platform, and then the distribution is carried out on the residual ores, so that the residual ores are prevented from entering a central ore-free area;
2) when the coke is distributed, the distributing chute closes the throttle valve at the minimum gear after the coke platform is formed to stop distributing the coke, then opens the throttle valve to distribute the residual coke after the gear corresponding to the central coke is adjusted, and avoids distributing the coke on the ring belt between the secondary center and the central coke; the coke finally distributed into the furnace is divided into 2 parts of platform coke and central coke.
The distribution matrix of the ore is
O denotes ore, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
The distribution matrix of the coke is
C denotes coke, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
The central coke content is 15-20%, and the platform coke content is 80-85%.
The following examples are carried out on the premise of the technical scheme of the invention, and detailed embodiments and specific operation processes are given, but the scope of the invention is not limited to the following examples.
[ examples ] A method for producing a compound
In this example, 3200m3The blast furnace adopts bell-less furnace top equipment, a spiral (multi-ring) material distribution mode is normally used, the material distribution chute can rotate within the range of 360 degrees, and the inclination angle of the material distribution chute can be adjusted within the range of 0-53 degrees. The width of the ore platform is 1.52m, and the height of the material line is 1.5 m.
Comparative example 1 adopts the original ore distribution mode, and the distribution matrix of the ore is
The simulated charge level A is shown in figure 1, and the ore slides from the ore platform to the central ore-free area.
Example 1 Using the distribution pattern of the present invention, the distribution matrix of the ore was
The working principle is as follows: after the ore distribution platform is finished, the distribution chute is directly tilted back to the middle gear from the minimum gear, then the distribution is continued, and a small amount of ore is prevented from entering a central ore-free area in the process that the distribution chute is continuously tilted down. The simulated level A is shown in figure 2, and the ore of the ore platform does not slip.
Comparative example 2 adopts the original coke distribution mode, and the distribution matrix of coke is:
simulated charge level a as shown in fig. 3, coke had a phenomenon of slipping down to the annulus between the secondary center and the central coke position.
Example 2 uses a coke distribution matrix of
The working principle is as follows: the fabric chute closes the throttle valve at the minimum gear position after the coke distribution platform to stop distributing the fabric, and the fabric is distributedThe material chute continues to decline to the gear that corresponds central burnt, then opens the choke valve and continues the cloth, with surplus coke (central burnt) cloth in the blast furnace center, avoids cloth into the coke on the clitellum between inferior center and central burnt gear, reduces blast furnace charge level central burnt heap ring size, improves the accuracy of central burnt volume to stabilize blast furnace central air current. Simulated charge level a as shown in fig. 4, coke did not slip down the annulus between the sub-center and the center coke position.
As shown in fig. 5, in example 2, coke is divided into two parts and distributed into the blast furnace, namely, a platform coke part i and a central coke part ii, in order to ensure smooth and stable air flow in the center of the blast furnace, high-quality coke is distributed into the center (in this example, the proportion is 18%) and ordinary coke is distributed into the coke platform (in this example, the proportion is 82%) according to the actual coke conditions on site, so that resource optimization configuration is realized, and the cost of iron-making coke is reduced while a better smelting effect is achieved.
In the embodiment, the central air flow of the blast furnace is stabilized through the accurate distribution of coke and ore in the central non-ore area, so that the furnace condition of the blast furnace is more stable, the air quantity entering the furnace is increased, the yield is improved, the coke ratio and the fuel ratio are reduced, and the coal gas utilization rate is improved; the details are shown in the following table:
| serial number | Name of item | Comparative example | Examples |
| 1 | Air quantity m3/min | 5500 | 5650 |
| 2 | Yield t/day | 7900 | 8000 |
| 3 | Coke ratio kg/t | 370 | 365 |
| 4 | Fuel ratio kg/t | 520 | 515 |
The above description is only for the preferred embodiment of the present invention, but the scope of the present invention is not limited thereto, and any person skilled in the art should be considered to be within the technical scope of the present invention, and the technical solutions and the inventive concepts thereof according to the present invention should be equivalent or changed within the scope of the present invention.
Claims (4)
1. A material distribution method for stabilizing central airflow of a blast furnace adopts a bell-less multi-ring material distribution mode; it is characterized by comprising:
1) when distributing the ores, the minimum gear of the distributing chute after the ore platform is formed is directly adjusted back to the gear in the middle of the corresponding ore platform, and then the distribution is carried out on the residual ores, so that the residual ores are prevented from entering a central ore-free area;
2) when the coke is distributed, the distributing chute closes the throttle valve at the minimum gear after the coke platform is formed to stop distributing the coke, then opens the throttle valve to distribute the residual coke after the gear corresponding to the central coke is adjusted, and avoids distributing the coke on the ring belt between the secondary center and the central coke; the coke finally distributed into the furnace is divided into 2 parts of platform coke and central coke.
2. The method for distributing and stabilizing blast furnace core gas flow according to claim 1, wherein the distribution matrix of ore is
O denotes ore, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
3. The burden distribution method for stabilizing central gas flow of a blast furnace according to claim 1, wherein the burden distribution matrix of ore 0 ore is
C denotes coke, the numerical superscript denotes the gear, and the numerical subscript denotes the number of turns of the corresponding gear.
4. The burden distribution method for stabilizing the central air flow of the blast furnace as claimed in claim 1, wherein the central coke proportion is 15% -20% and the platform coke proportion is 80% -85%.
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111298989.5A CN114150095A (en) | 2021-11-04 | 2021-11-04 | Material distribution method for stabilizing central airflow of blast furnace |
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| Application Number | Priority Date | Filing Date | Title |
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| CN202111298989.5A CN114150095A (en) | 2021-11-04 | 2021-11-04 | Material distribution method for stabilizing central airflow of blast furnace |
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| CN114150095A true CN114150095A (en) | 2022-03-08 |
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Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108959760A (en) * | 2018-06-29 | 2018-12-07 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device of great-jump-forward centre plus burnt cloth |
| CN108950114A (en) * | 2018-09-14 | 2018-12-07 | 柳州钢铁股份有限公司 | The accurate cloth coking process of blast furnace |
| CN112226559A (en) * | 2020-10-20 | 2021-01-15 | 本钢板材股份有限公司 | Method for central coking cloth |
| CN112410484A (en) * | 2020-11-18 | 2021-02-26 | 山东钢铁集团日照有限公司 | Blast furnace distributing method for interval ore pressing |
| CN113136467A (en) * | 2021-04-15 | 2021-07-20 | 鞍钢股份有限公司 | Efficient central focusing matrix setting method based on charge level iteration |
-
2021
- 2021-11-04 CN CN202111298989.5A patent/CN114150095A/en active Pending
Patent Citations (5)
| Publication number | Priority date | Publication date | Assignee | Title |
|---|---|---|---|---|
| CN108959760A (en) * | 2018-06-29 | 2018-12-07 | 首钢京唐钢铁联合有限责任公司 | A kind of method and device of great-jump-forward centre plus burnt cloth |
| CN108950114A (en) * | 2018-09-14 | 2018-12-07 | 柳州钢铁股份有限公司 | The accurate cloth coking process of blast furnace |
| CN112226559A (en) * | 2020-10-20 | 2021-01-15 | 本钢板材股份有限公司 | Method for central coking cloth |
| CN112410484A (en) * | 2020-11-18 | 2021-02-26 | 山东钢铁集团日照有限公司 | Blast furnace distributing method for interval ore pressing |
| CN113136467A (en) * | 2021-04-15 | 2021-07-20 | 鞍钢股份有限公司 | Efficient central focusing matrix setting method based on charge level iteration |
Non-Patent Citations (1)
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| 雷发荣等: "柳钢4号2000 m~3高炉炉役后期布料制度探索实践", 《中国冶金》 * |
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Application publication date: 20220308 |